Make the beef marinade by mixing the listed ingredients. Save a ⅓ of the sauce in a separate bowl - we will use it later

Place the remaining ⅔ of the sauce in a mixing bowl. Cut skirt steak into a finger's length and place them into the marinade in the mixing bowl.

Bring a pot of water to boil. Quickly blanche the Oyster and Shiitake mushrooms for 30 seconds. Give them a quick rinse in cold water. Squeeze out the water from each mushroom. Set Oyster mushroom aside. We will marinate the Shiitake mushrooms.

Pour the remaining ⅓ marinade over the Shiitake mushrooms. Set Shiitake mushrooms aside. Then place a frying pan on medium-high heat and quickly sear the beef pieces (no need to cook completely through).

Cut bell peppers and spring onion into finger's length. Then cut the marinated Shiitake Mushrooms into similar length.

Then place each one of the ingredients onto the toothpick. You can use more-or-less of any specific ingredients - but try to get a nice balance in color.

Then set aside each completed pancake for the egg-wash (skip to step 3, when ready to cook)

Rinse the frozen filet thaw in water. Then set in a bowl and let them dethaw in room temperature.

Use paper towels to pat-down the filet pieces and soak up any excess water.

Salt and pepper both sides of each piece.

Then cut the fillet into thinner, small bite-sized pieces (cut the filet at an angle). Go to next step.

Put Korean pancake batter (or all-pupose flour!) into a plastic bag. Then place each pancake pieces into the bag and shake it around. Take out each one and make sure to tap-off any extra flour left.

Crack three eggs and whisk in a large mixing bowl. Season the egg mixture with a few shakes of salt. Then place each flour-battered pancake (pasanjeok or dongtaejeon) into the egg wash.

Place a frying pan on low-heat. Put in plenty of vegetable oil. Once it is hot, place each battered piece into the frying pan. Fry on both sides (a few minutes on each side) until a golden color. Adjust heat as necessary. Dip into soy-sauce and enjoy!